There's an unwritten rule in football that when the ball is sportingly played back to the team in possession after a break in play—usually the result of an injury—it's allowed to make its journey.
Nobody told Shakhtar Donetsk's Brazilian striker Luiz Adriano, who scored one of the most controversial goals in Champions League history against Nordsjaelland on Tuesday night.
Played was stopped by the referee after a Nordsjaelland player went down hurt midway through the first half, and with the Danish hosts owners of surprise 1-0 lead.
Shakhtar's Willian explained he would take the drop-ball unchallenged and pass it back to Nordsjaelland's goalkeeper from inside his own half. So far, so good.
Only Adriano had other ideas. As Willian's lobbed ball made its way into the Nordsjaelland half, Adriano took possession and proceeded to round the goalkeeper and slot home to bring the Ukrainians level.
What followed was the bemused and angry reaction of Nordsjaelland players, who couldn't quite believe what they'd just seen.
The Danes scored again to regain their lead, only for Shakhtar to kick into gear and find the net four times without reply to win the game 5-2.
To make things even harder to bear, Adriano helped himself to a hat trick.